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In article ,
says...
In et, Steve Kraus wrote:

Eh...ditch the fluorescents and MH's and get *low* pressure sodium. Not
the pinky yellow of most contemporary streetlights (high pressure sodium),
LP sodium give that nice almost monochromatic yellow which you don't see
much of anymore but used to be used for parking lots and some streets.
IIRC more lumens per Watt than anything.

Is this sarcasm?

Low pressure sodium does indeed achieve more lumens per watt than
anything else, but I would not use it even to illuminate a parking lot.

The monochromatic orange-yellow light turns everything into an
orange-yellow version of black-and-white!
.....
I thought the lowest possible color rendering index was zero until I
heard that low pressure sodium rates a -44.

I don't know the CRI, but I have to agree, it's the worst light I can
imagine for a home or shop. I had a college classroom that was lit
with LP sodium, a horrible idea that was no doubt some sort of energy
conservation experiment. Though, since it was a psych classroom, we
all wondered what the experiment really was....

--
is Joshua Putnam
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